It depends, a senior (with enough experience) usually charges 35€ per hour, although there are those who charge less ### for being in small companies or for any other reason.

It depends on several factors. Some of these are the country where you work, the relationship between supply and demand of these professionals, the knowledge they have or their experience working with this technology.

Here in Spain a professional with no or little experience can earn around 20,000 euros a year.

A professional with more experience, three to five years can earn around 30,000 euros a year.

These figures are approximate and will depend on the negotiation that the programmer makes with the company.